I remember the ancient days when laptops came with two battery bays so that a person could exchange one battery while the other kept the laptop running. While at university I remember there being a charging station for the spare batteries so that the staff could charge up a handful of batteries so the laptop wouldn't die on them while they were working away from their desk.
Later on CD-ROM drives became a thing and people had the option of pulling out the drive to make room for a second battery. I don't recall anyone actually doing this but it was an option. About this same time, as the student IT guy, it was my job to take the laptop battery charger to the surplus inventory warehouse. I don't recall ever seeing a means to charge a laptop battery other than the laptop itself since.
At some point the CD drives, while still removable, didn't have the battery connection points in that bay any more. This was so people could instead opt for a floppy drive, DVD drive, or simply to leave the bay empty and save some weight. While not necessarily battery related I also noticed the removal of these drives become more difficult over time. I guess people didn't upgrade and/or replace them as often as they used to. The loss of the spare battery connection points must have also signaled that having a spare battery wasn't the selling point it used to be.
What remained for a long time though were user replaceable batteries. People just didn't seem to carry spare batteries anymore, which showed in the design of the laptop bags. It used to be that a laptop bag might have pockets for three or four spare batteries, then pockets for one or two, and then none.
People might have to replace the batteries in a laptop once or twice in the useful lifespan of the computer. Again this was reflected in the ease of replacing the batteries. It used to be that replacing a battery took one hand and an easy to locate latch, back when computers had the option for two of them. Then it became a matter of flipping them over to reach a less obvious latch. Then batteries started to be behind a door, first held in place with a latch and then later with a screw. Now, most every laptop will require one to remove several screws to get to the battery, assuming the battery is user replaceable at all.
We saw a similar series of events happen with cell phones. People, for the most part, don't want to replace batteries. People want their electronics to last as long as possible between charges. This has been reflected in what people buy and therefore in what manufacturers offer. If people were still content with having to carry four spare batteries with them to keep their laptops and cell phones running through the day then we'd have much smaller and lighter devices, but then we'd also have to carry those batteries somewhere somehow. But the truth is that people will willingly sacrifice in the size and weight of their devices in order that they'd never have to be concerned with changing the batteries. One way to make up for some of the size and weight of having higher capacity batteries is to remove the pieces and parts that make them easy to replace. This has the added benefit of making the devices more durable and cheaper.
Another benefit of making it difficult to replace batteries is it keeps people from putting in after market, and therefore likely substandard, batteries that can damage a device. Now that batteries have reached the durability and capacity we have today it is rare for anyone to even consider the lack of a user replaceable battery as a problem. There are times like this, where a battery problem highlights where the inability for a user to replace a battery can be problematic, it would seem that the makers of these devices are willing to put up with the challenges because of how rare it happens. People seem willing to buy these devices. If people demanded user replaceable batteries then the device makers would continue to offer them.
If the lack of user replaceable batteries bother you then perhaps you need to be more vocal. But then money speaks louder than words. If you want that feature so bad then you will have to pay for it.